JEE Mains · Physics · STD 12 - Semicondutor electronics
- JEE Mains 2020
- Easy
- MCQ
If a semiconductor photodiode can detect a photon with a maximum wavelength of \(400\, nm ,\) then its band gap energy is Planck's constant \(h=6.63 \times 10^{-34}\, J . s\) Speed of ligh \(c =3 \times 10^{8}\, m / s\)
Pick an option to check your answer.
Answer & Solution
Correct Answer
(C) \(3.1\; eV\)
Step-by-step Solution
Detailed explanation
\(\Delta E =\frac{h c }{\lambda e }=3.1\; eV\)
More questions from Physics
- A child of mass \(5\,kg\) is going round a merry-goround that makes \(1\) rotation in \(3.14\,s\). The radius of the merry-go-round is \(2\,m\). The centrifugal force on the child will be \(.......\,N\)JEE Mains 2023 Medium
- The truth of the given circuit diagram is _______.
JEE Mains 2024 Hard - Three infinitely long wires with linear charge density \(\lambda\) are placed along the \(x-a x i s, y\)-axis and \(z-\) axis respectively. Which of the following denotes an equipotential surface?JEE Mains 2025 Hard
- The gap between the plates of a parallel plate capacitor of area \(A\) and distance between plates \(d\), is filled with a dielectric whose permittivity varies linearly from \({ \varepsilon _1}\) at one plate to \({ \varepsilon _2}\) at the other. The capacitance of capacitor isJEE Mains 2014 Hard
- A metre scale is balanced on a knife edge at its centre. When two coins, each of mass \(10\, g\) are put one on the top of the other at the \(10.0\, cm\) mark the scale is found to be balanced at \(40.0\, cm\) mark. The mass of the metre scale is found to be \(x \times 10^{-2}\) \(kg\). The value of \(x\) isJEE Mains 2022 Medium
- Which of the following physical quantities have the same dimensions?JEE Mains 2022 Hard
More PYQs from JEE Mains
- The energy dissipated by a resistor is \(10 \,mJ\) in \(1\,s\) when an electric current of \(2\, mA\) flows through it. The resistance is \(....... \Omega\) (Round off to the Nearest Integer)JEE Mains 2021 Easy
- Energy of \(10\) non rigid diatomic molecules at temperature \(\mathrm{T}\) is _______.JEE Mains 2024 Hard
- A hydrogen atom makes a transition from \(n = 2\) to \(n = 1\) and emits a photon. This photon strikes a doubly ionized lithium atom \((z = 3)\) in excited state and completely removes the orbiting electron. The least quantum number for the excited state of the ion for the process isJEE Mains 2016 Hard
- Match List\(-I\) with List\(-II.\)
List\(-I\) List\(-II\) \((a)\) \(10\, km\) height over earth's surface \((i)\) Thermosphere \((b)\) \(70\, km\) height over earth's surface \((ii)\) Mesosphere \((c)\) \(180\, km\) height over earth's surface \((iii)\) Stratosphere \((d)\) \(270\, km\) height over earth's surface \((iv)\) Troposphere JEE Mains 2021 Medium - Assume that protons and neutrons have equal masses. Mass of a nucleon is \(1.6 \times 10^{-27}\,kg\) and radius of nucleus is \(1.5 \times 10^{-15} A ^{1 / 3}\,m\). The approximate ratio of the nuclear density and water density is \(n \times 10^{13}\). The value of \(n\) is \(.................\)JEE Mains 2023 Medium